Circuit Breakers and Switchgears Inspection, Maintenance, Design, Repair & Troubleshooting
12 -16 January 2026
Sandton Johannesburg South Africa
Cost per Delegate
R19,999.00
Introduction
This program is designed to update participants with the latest development of Circuit Breakers and to present some of the more common and updated aspects of low, medium and high voltage switchgear maintenance. It must be understood that there is an incredible variety of equipment used on low, medium and high voltage switchgear today.
Switchgears play an important role in the distribution and control of electrical power in manufacturing or power plant and in a utility distribution system. Negligent maintenance practices can lead to power system inefficiency and loss of system reliability.
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Objectives:
At the end of the training, the participants will be able to:
• Inspect, maintain, design, repair and troubleshoot circuit breakers and switchgears
• Apply an in-depth knowledge and skills on LV/MV/HV circuit breakers and switchgears
• Describe the switchgear details such as ratings, degree of protection, service conditions and ancillary equipment
• Explain switchgear asset management including CBM & RCM process, tripping devices,
maintenance & testing and identify the various switchgear diagnostic techniques
• Identify & employ the different types of circuit breaker techniques and determine the
switchgear vital equipment’s including batteries condition and monitoring
• Employ the substation maintenance techniques and discuss their description, structures,
features and functions
• Apply the switchgear maintenance practices and improve maintenance and repair procedures
• Carryout maintenance work orders including their process development, procedures and
problems encountered
• Introduce computerized maintenance management systems (CMMS) and recognize its
importance in circuit breakers inspection, maintenance, design, repair & troubleshooting
Who Should Attend?
Course Outline
General Introduction
• Electrical engineering basic concepts
• Three phase review and per unit
• Voltage levels
• One line and three-line diagram
• Generation system layout
• Transmission system layout
• Substation system layout
• Distribution system layout
Industrial Switchgears
• Fuses
• Auto-reclosers
• Automatic sectionalizer
• Circuit Breakers
• Isolator switches
• Load switches
• Relays
• Current transformers
• Voltage transformers
CB Design Specification Based on Short Circuit Current Level
• Per unit system
• Faults on power systems
• Transient phenomena in power system.
• Symmetrical component analysis of three phase network
• Network connection for various fault types
• Current and voltage distribution in system due to a fault
• Effect of system on zero sequence quantities
• Computer programs based short circuit calculation.
CB Design Specification Based on Arc Phenomena and Circuit Interruption
• Arc phenomena
• Maintenance of the Arc
• Properties of Arc
• Arc Interruption theory
• Circuit Breaker Rating
• Circuit constants and circuit conditions
• Conditions of severity
• Restriking voltage transient
• Class A ultra-fast transients
• Class B system transients
• Class C low transients
• Transmission line transient
• Switching transients
• Duties of Switchgear
LV Circuit Breakers
• Low voltage molded case current limiting circuit breakers
• Low voltage molded case circuit breakers with high breaking capacity
• Insulated case circuit breakers
• Low voltage air circuit breakers
• Low voltage circuit breakers specification
Modern MV and HV Vacuum CB
• Introduction
• Advantages of vacuum interruption
• Vacuum contactors and interrupters
• The vacuum medium
• The vacuum arc
• Vacuum arc stability
• Vacuum break down
• Vacuum switch construction
• Applications of vacuum circuit breakers
Modern MV and HV SF6 CB Introduction
asic Features of SF6 Breakers
• Dielectric properties of SF6
• Quenching properties of SF6
• Construction of SF6 breaker
• SF6 CB types
• Puffer type SF6 breakers
• Double Pressure System
• Single Pressure Puffer-Piston System
• Single Pressure Self Blast System
• Improvement in SF6 Breakers for HV
Other Type of Circuit Breakers
Air Circuit Breakers
• Method of increasing arc resistance
• Plan break type
• Magnetic blow out type
• Arc splitter type
• Application
• Construction and operation
• Axial air CB
• Blast air CB
Oil Circuit Breakers
• Arc rupture under oil
• Advantages of oil
• Disadvantages of oil
• Plan break oil circuit breakers
• Arc control circuit oil breakers
• Minimum oil circuit breakers
• Construction and operation
Dc Circuit Breakers
• Construction
• Methods of interruption
• Application
Circuit Breaker Inspection, Maintenance and Services
• Inspection
• General inspection technical procedure
• Daily inspection of circuit breakers
• Monthly inspection of circuit breakers
• Annual inspection of circuit breakers
• Disassembly
• Cleaning
• Tightening
• Lubrication
• Equipments used in testing
• Testing procedure
• Direct testing
• Contact resistance test.
• Insulation resistance test
• Test report
• Indirect testing
• One hour Video, HV CB Maintenance and Repair)
Circuit Breakers Control, Protection and Testing
• Switchgears control devices and wiring
• Switchgear’s protection devices and wiring
• Testing Classification
• Testing laboratories
• Description of a simple testing station
CB Troubleshooting
• Low insulation Resistance (below 2000 Mega-ohms) between a) Phase terminal and earthed frame, with breaker closed b) Phase terminals of a pole.
• Resistance between Terminals of Pole too high (above 100 microhms) (15 micro-ohm per joint) contact
• Unequal contact Wipe and Travel in 3-pole Measured from top surface of interrupter flange and the contact lip by a simple rod with a) breaker open and b) breaker closed
• One of the pole docs not close.
• Breaker operation too Slow During opening timing from trip command to contact separation instant too large (60 ms instead of say 40 ms)
End of the Workshop
For Training arrangements call us on the detail below
TANZANIA: +255 749 50 26 78
SOUTH AFRICA: +27 694 31 79 73
KENYA: +255 749 50 26 78
DUBAI: +27 694 31 79 73
